Answer
$\frac{\sqrt {-4p+400}}{25}+600$
Work Step by Step
$p=-0.25x+100\\-4p=x-400\\x=-4p+400$
Thus $C(p)=\frac{\sqrt x}{25}+600=\frac{\sqrt {-4p+400}}{25}+600$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.